diff --git a/ports/stm32/boards/NUCLEO_F429ZI/mpconfigboard.h b/ports/stm32/boards/NUCLEO_F429ZI/mpconfigboard.h
index 42cc9d68cd..608beef672 100644
--- a/ports/stm32/boards/NUCLEO_F429ZI/mpconfigboard.h
+++ b/ports/stm32/boards/NUCLEO_F429ZI/mpconfigboard.h
@@ -16,9 +16,9 @@
 
 // HSE is 8MHz
 #define MICROPY_HW_CLK_PLLM (8)
-#define MICROPY_HW_CLK_PLLN (180)
+#define MICROPY_HW_CLK_PLLN (336)
 #define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV2)
-#define MICROPY_HW_CLK_PLLQ (4)
+#define MICROPY_HW_CLK_PLLQ (7)
 
 // From the reference manual, for 2.7V to 3.6V
 // 151-180 MHz => 5 wait states